Re: [Xen-devel] [PATCH RFC 2/4] x86/dom0: prevent PVH Dom0 from mapping read-only the IO APIC area

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Fri, Jun 30, 2017 at 05:31:36AM -0600, Jan Beulich wrote:
> >>> Roger Pau Monne <roger.pau@xxxxxxxxxx> 04/24/17 1:52 PM >>>
> >This is emulated by Xen and must not be mapped into PVH Dom0 p2m.
> 
> Yes, but this reminds of of the reason we permit the r/o mapping in PV
> Dom0, and I wonder how well the emulated variant is going to work with
> ACPI methods accessing the IO-APICs. Let's hope there's not going to
> be any problems.

Won't ACPI be satisfied by accessing the emulated vIO APIC? That's
available, and should reflect the real IO APIC state in most cases
(except for GSIs in use by Xen).

Roger.

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